Publication

Article Metrics

Citations


Online attention

Atomic structure and devitrification of the Mg82Ca8Au10 metallic glass

DOI: 10.1016/j.jnoncrysol.2024.123157 DOI Help

Authors: Z. Molčanová (Institute of Materials Research, Slovak Academy of Sciences) , K. Saksl (Technical University of Košice; Institute of Materials Research, Slovak Academy of Sciences) , J. Durisin (Technical University of Košice) , S. Michalik (Diamond Light Source) , B. Ballóková (Institute of Materials Research, Slovak Academy of Sciences) , J. Darpentigny (CEA-Saclay) , P. Jóvári (Institute for Solid State Physics and Optics (Hungary))
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Non-Crystalline Solids , VOL 642

State: Published (Approved)
Published: October 2024

Open Access Open Access

Abstract: Short range order of a ternary Mg82Ca8Au10 biodegradable amorphous alloy was studied by combining diffraction datasets and Au L3 edge EXAFS data by the Reverse Monte Carlo simulation technique. It was found that while the Mg–Mg bond length agrees well with the empirical atomic diameter of Mg, both the Mg–Ca and Mg–Au mean interatomic distances are ∼9 % shorter than the sum of the corresponding atomic radii. The Ca–Au bond length exhibits ∼14 % shortening. The linear expansion coefficients of the glass determined from the temperature induced shift of the first peak of the structure factor and the reduced pair distribution function are ∼3.7 × 10−5 K−1 and ∼3.1 × 10−5 K−1, respectively. During devitrification, two crystalline phases emerge from the amorphous alloy: hexagonal AuMg3 and the solid solution of Ca in hexagonal close packed Mg. The thermal expansion behaviour of the AuMg3 unit cell was also determined using diffraction data.

Journal Keywords: Metallic glass; Differential scanning calorimetry; Neutron diffraction; X-ray diffraction; EXAFS; Reverse Monte Carlo; Atomic structure; Unit cell parameters

Diamond Keywords: Alloys

Subject Areas: Materials

Facility: P21.1 at PETRA III

Added On: 14/08/2024 10:56

Documents:
1-s2.0-S002230932400334X-main.pdf

Discipline Tags:

Materials Science Metallurgy

Technical Tags: